Nautel NV3.5, Troubleshooting Manual

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NV5/NV3.5 Troubleshooting Manual Responding to alarms
Page 1-16 Issue 3.2 2014-12-10
Exciter A/B: Digital 1
(or 2) Low This alarm indicates the corresponding digital input level is too low
(default threshold is 22.5 dB below full scale). Typically accompanied
by a Primary (or Secondary) Digital SRC Unlock alarm (see
associated troubleshooting action). If no accompanying SRC alarm
exists, check the external audio processor or studio feed.
Exciter A/B: Entered
Firmware Upgrade This alarm occurs when the exciter is in “firmware upgrade” mode. It
should only be displayed during a transmitter software upgrade.
Exciter A/B: Exgine
Not Booted This alarm occurs, in FM+HD or HD mode, when the exciter is initally
powered up, but the Exgine PWB (A3) has not finshed its boot-up
sequence. Normally, the alarm will clear on its own. If not, suspect a
defective Exgine PWB.
Exciter A/B: Exgine
Offline This alarm occurs, in FM+HD or HD mode, when the exciter is not
communicating with the Exgine PWB (A3). Check the ribbon cable
between the Exgine PWB (A3) and J15 of the NVE exciter PWB (A1).
Check the Exgine PWB.
Exciter A/B: External
Mute This alarm occurs if a ground potential is applied to pin 7 of connector
A1J4A or pin 1 of connector A1J7A on the exciter’s back panel. The
exciter’s RF output is reduced to 0 W.
Exciter A/B: Fan Fail This alarm occurs if the exciter’s cooling fan (B1) speed is too low.
This alarm does not directly inhibit the exciter’s RF output, but may
result in a PA Over Temperature alarm, which will inhibit the output.
Inspect the fan for a possible blockage.
Exciter A/B: FPGA
Test Failed There was a programming failure with the initial startup sequence of
the NVE exciter PWB (A1). Possibly indicates a failed software
upgrade or a hardware failure on the NVE exciter PWB.
Exciter A/B: Invalid
HD Data This alarms occurs, in FM+HD or HD mode, if IBOC data is detected
from the Exgine PWB, but is not usable (all logic 0s). Digital carriers
are muted. Check the IBOC data source.
Exciter A/B: IPA Volts
Fail This alarm indicates the first-stage amplifier’s PA voltage is outside its
acceptable range of 24.3 to 29.7 V. Check the exciter’s power supply
(U3).
Alarm (with Prefix) Description and Troubleshooting Action